7.72 Batteries A certain type of automobile bat- tery is known to last an average of 1110...
Question:
7.72 Batteries A certain type of automobile bat- tery is known to last an average of 1110 days with a standard deviation of 80 days. If 400 of these batteries are selected, find the following probabilities for the average length of life of the selected batteries:
a. The average is between 1100 and 1110.
b. The average is greater than 1120.
c. The average is less than 900.
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Related Book For 
Introduction To Probability And Statistics
ISBN: 9780176509804
3rd Edition
Authors: William Mendenhall
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